- Baker Equipment & Supplies, Markdale - Donut Maker, etc
- Banks, Markdale
- Baptist Churches, Markdale
- Barbecue Restaurants, Markdale
- Barber Shops, Markdale
- Bars, Markdale
- Bars & Grills, Markdale
- Baseball Cards & Sports Memorabilia, Markdale
- Beauty Consultants, Markdale
- Beauty Salons, Markdale
- Bed & Breakfast, Markdale
- Beer & Wine Stores, Markdale
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- Blacksmiths, Markdale
- Boat & Yacht Manufacturers, Markdale
- Boats & Yachts, Markdale - Yachts, Sailboats & Boats for Sale
- Bookkeeping Services Licensed, Markdale
- Bookkeeping Systems & Services, Markdale
- Builders & Contractors, Markdale
- Builders & Contractors - More, Markdale
- Building Materials, Markdale - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Markdale
- Business Insurance, Markdale
- Business Legal Services, Markdale
- Business Services, Markdale
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